Effects of Gibberellic Acid, N-Dimethylaminosuccinamic Acid (Alar), Ringing and Thinning on McIntosh Apple Shape1

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Abstract
Fruit elongation, stem length, and stem-cavity depth of ‘McIntosh’ apples were increased by some gibberellic acid (GA) treatments and decreased by a fall spray of N-di-methylaminosuccinamic acid (Alar). Summer sprays of Alar and thinning had no measurable effect on apple shape. Ringing increased fruit elongation. These results are consistent with the concept that endogenous gibberellins act to control apple shape.

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